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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>80386 Programmer's Reference Manual -- Opcode POPF</TITLE></HEAD><BODY><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="POPA.htm"> POPA/POPAD Pop all General Registers</A><BR><B>next:</B><A HREF="PUSH.htm"> PUSH Push Operand onto the Stack</A><P><HR><P><H1>POPF/POPFD -- Pop Stack into FLAGS or EFLAGS Register</H1><PRE>Opcode Instruction Clocks Description9D POPF 5 Pop top of stack FLAGS9D POPFD 5 Pop top of stack into EFLAGS</PRE><H2>Operation</H2>Flags := Pop();<H2>Description</H2>POPF/POPFD pops the word or doubleword on the top of the stack andstores the value in the flags register. If the operand-size attribute ofthe instruction is 16 bits, then a word is popped and the value is stored inFLAGS. If the operand-size attribute is 32 bits, then a doubleword is poppedand the value is stored in EFLAGS.<P>Refer to <A HREF="c02.htm">Chapter 2</A> and <A HREF="c04.htm">Chapter 4</A> for information about the FLAGSand EFLAGS registers. Note that bits 16 and 17 of EFLAGS, calledVM and RF, respectively, are not affected by POPF or POPFD.<P>The I/O privilege level is altered only when executing at privilege level0. The interrupt flag is altered only when executing at a level at least asprivileged as the I/O privilege level. (Real-address mode is equivalent toprivilege level 0.) If a POPF instruction is executed with insufficientprivilege, an exception does not occur, but the privileged bits do notchange.<H2>Flags Affected</H2>All flags except VM and RF<H2>Protected Mode Exceptions</H2>#SS(0) if the top of stack is not within the stack segment<H2>Real Address Mode Exceptions</H2>Interrupt 13 if any part of the operand would lie outside of the effectiveaddress space from 0 to 0FFFFH<H2>Virtual 8086 Mode Exceptions</H2>#GP(0) fault if IOPL is less than 3, to permit emulation<P><HR><P><B>up:</B> <A HREF="c17.htm">Chapter 17 -- 80386 Instruction Set</A><BR><B>prev:</B><A HREF="POPA.htm"> POPA/POPAD Pop all General Registers</A><BR><B>next:</B><A HREF="PUSH.htm"> PUSH Push Operand onto the Stack</A></BODY>⌨️ 快捷键说明
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